Multiple choice

The average marks of 45 students in the class is 86. The average marks of first 22 students is 92 and that of last 22 students is 81. Find the marks of the 23rd student in the class.

  1. 77

  2. 64

  3. 72

  4. 83
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total marks for 45 students = 45 × 86 = 3870. First 22 students total = 22 × 92 = 2024. Last 22 students total = 22 × 81 = 1782. The 23rd student's marks = Total - (First 22 + Last 22) = 3870 - (2024 + 1782) = 3870 - 3806 = 64. Option B is correct.

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